Package org.apache.accumulo.core.file.blockfile.cache

Class CachedBlock

java.lang.Object

org.apache.accumulo.core.file.blockfile.cache.CachedBlock

All Implemented Interfaces:

Comparable<CachedBlock>, CacheEntry, HeapSize

public class CachedBlock
extends Object
implements HeapSize, Comparable<CachedBlock>, CacheEntry

Represents an entry in the LruBlockCache.

Makes the block memory-aware with HeapSize and Comparable to sort by access time for the LRU. It also takes care of priority by either instantiating as in-memory or handling the transition from single to multiple access.

Field Summary

Fields

Modifier and Type	Field	Description
static long	PER_BLOCK_OVERHEAD

Constructor Summary

Constructors

Constructor	Description
CachedBlock(String blockName, byte[] buf, long accessTime, boolean inMemory)

Method Summary

Modifier and Type	Method	Description
void	access(long accessTime)	Block has been accessed.
int	compareTo(CachedBlock that)
boolean	equals(Object obj)
byte[]	getBuffer()
Object	getIndex()
String	getName()
org.apache.accumulo.core.file.blockfile.cache.CachedBlock.BlockPriority	getPriority()
int	hashCode()
long	heapSize()
void	setIndex(Object idx)

Methods inherited from class java.lang.Object

clone, finalize, getClass, notify, notifyAll, toString, wait, wait, wait

Field Detail

PER_BLOCK_OVERHEAD

public static final long PER_BLOCK_OVERHEAD

Constructor Detail

CachedBlock

public CachedBlock(String blockName,
                   byte[] buf,
                   long accessTime,
                   boolean inMemory)

Method Detail

access

public void access(long accessTime)

Block has been accessed. Update its local access time.

heapSize

public long heapSize()

Specified by:

heapSize in interface HeapSize

Returns:

Approximate 'exclusive deep size' of implementing object. Includes count of payload and hosting object sizings.

hashCode

public int hashCode()

Overrides:

hashCode in class Object

equals

public boolean equals(Object obj)

Overrides:

equals in class Object

compareTo

public int compareTo(CachedBlock that)

Specified by:

compareTo in interface Comparable<CachedBlock>

getBuffer

public byte[] getBuffer()

Specified by:

getBuffer in interface CacheEntry

getName

public String getName()

getPriority

public org.apache.accumulo.core.file.blockfile.cache.CachedBlock.BlockPriority getPriority()

getIndex

public Object getIndex()

Specified by:

getIndex in interface CacheEntry

setIndex

public void setIndex(Object idx)

Specified by:

setIndex in interface CacheEntry